[Future speculation!] Help me plan my next SFF rig?

Hey guys!

So, I know I'm jumping the gun a little (okay, a lot), but the Asus Swift along with the first of the Maxwell cards has me more than a bit excited. I'm going to be buying the Swift when it's released, and while G-Sync will let me make good use of my i5-3570k and GTX 670, I'll be wanting something more powerful.

My plan is to upgrade to the dual-chip Maxwell "890." If the time scheme of the 600 and 700 series are at all telling, it'll be released about this time next year. My hope is that Skylake will show up a little bit sooner than expected, since I would love to take advantage of DDR 4 RAM, but since it looks like Broadwell won't be showing up until late this year or early next year, I might have to go with that. (Unless I decide to wait until Skylake and see if Volta has been released since then, but that might just about kill me.)

So after all that setup... all I'm looking for right now is a case. xP

That is to say, I'm trying to figure out what the smallest I could cram a 11" GPU into would be without being limited by having to use a SFX power supply. Ideally it would support watercooling, but that's a maybe.

My eye is on the Caselabs S3. I currently have an S5, and regret it a little - it's bigger than I need. An S3 would still let me fit my 2x120mm and 2x140mm radiators and cool both the CPU and GPU, but the trouble is that it's still slightly larger than a Bitfenix Prodigy, and I would ideally like something even smaller.

Any thoughts? I can't seem to find (or even come up with) what the perfect case for me is. I'm considering looking at CNC milling, but even then, fitting everything I'm asking it to is not easy.